chore: add more content type support for log inserter api #48

Job	Run time
Check License Header	1m 21s
Check (windows-2022)	7m 22s
Check (ubuntu-20.04)	7m 37s
Check typos and docs	6s
Build GreptimeDB binaries (ubuntu-20.04)	7m 37s
Build GreptimeDB binary (profile-CI) (ubuntu-20.04)	7m 38s
Clippy	7m 37s
Rustfmt	1m 16s
Toml Check	3m 9s
coverage	1s
Sqlness Test with Kafka Wal	1s
Unstable Fuzz Test	1s
Sqlness Test	1s
Fuzz Test	1s
Fuzz Test (Distributed, Disk)	1s
	43m 49s

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